FOURIER TRANSFORM INFRARED EMISSION SPECTROSCOPY OF LaH AND LaD
Loading...
Date
1995
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The electronic emission spectra of LaH and LaD were investigated in the 750 nm to $3 \mu m$ spectral region using a Fourier transform spectrometer. The bands were excited in a lanthanum hollow cathode lamp in the presence of a mixture of neon and $H_{2}$ or $D_{2}$. The observed bands have been classified into two electronic transitions. $B^{1}\Pi - X^{1}\Sigma^{+}$ and $e^{3}\Phi - a^{3}\Delta$ (following the notation for YH in J. Chem. Phys. 101, 9283-9288 (1994). The laH bands observed in the $4000-4550 cm^{-1}$ region with Q-heads at $4533 cm^{-1}$ and $4429 cm^{-1}$ have been assigned as the 0-0 and 1-1 bands of the $B^{1}\Pi - X^{1}\Sigma^{+}$ transition. To higher wavenumbers a group of bands observed in the $5600-6350 cm^{-1}$ region have been assigned into ${^{3}}\Phi_{2} - {^{3}}\Delta_{l}, {^{3}}\Phi_{3} - {^{3}}\Delta_{2}$ and ${^{3}}\Phi_{4}$ sub-bands of a new electronic transition $e^{3}\Phi - a^{3}\Delta$. The rotational analysis of the 0-0 and 1-1 bands of each transition has been carried out and the equilibrium constants for the ground and excited states have been obtained.
Description
Author Institution: University of Arizona, Tucson, AZ 85721.; University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.